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<center><A HREF="lex.htm">Introduction</A> | <A HREF="lex_bib.htm">Bibliography</A></center></center>
<hr>
<center>
<font size=-1><b>
<A HREF="lex_1.htm">1-9</A> |
<A HREF="lex_a.htm">A</A> |
<A HREF="lex_b.htm">B</A> |
<A HREF="lex_c.htm">C</A> |
<A HREF="lex_d.htm">D</A> |
<A HREF="lex_e.htm">E</A> |
<A HREF="lex_f.htm">F</A> |
<A HREF="lex_g.htm">G</A> |
<A HREF="lex_h.htm">H</A> |
<A HREF="lex_i.htm">I</A> |
<A HREF="lex_j.htm">J</A> |
<A HREF="lex_k.htm">K</A> |
<A HREF="lex_l.htm">L</A> |
<A HREF="lex_m.htm">M</A> |
<A HREF="lex_n.htm">N</A> |
<A HREF="lex_o.htm">O</A> |
<A HREF="lex_p.htm">P</A> |
<A HREF="lex_q.htm">Q</A> |
<A HREF="lex_r.htm">R</A> |
<A HREF="lex_s.htm">S</A> |
<A HREF="lex_t.htm">T</A> |
<A HREF="lex_u.htm">U</A> |
<A HREF="lex_v.htm">V</A> |
<A HREF="lex_w.htm">W</A> |
<A HREF="lex_x.htm">X</A> |
<A HREF="lex_y.htm">Y</A> |
<A href="lex_z.htm">Z</A></b></font>

</center>
<hr>
<p><a name=b>:</a><b>B</b> = <a href="#bheptomino">B-heptomino</a>
<p><a name=b29>:</a><b>B29</b> (<i>c</i>/4 diagonally, p4) The following <a href="lex_s.htm#spaceship">spaceship</a>, found by Hartmut
Holzwart in September 2004.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.......OOO.......
.......O.........
OOO......O.......
O......O.O.......
.O....OO.OOOO....
...OOOO.OOOOO.OO.
....OO.......OO.O
</a></pre></td></tr></table></center>
<p><a name=b52bomber>:</a><b>B-52 bomber</b> The following p104 <a href="lex_d.htm#doublebarrelled">double-barrelled</a> <a href="lex_g.htm#glider">glider</a> <a href="lex_g.htm#gun">gun</a>.
It uses a <a href="#bheptomino">B-heptomino</a> and emits one glider every 52 generations.
It was found by Noam Elkies in March 1996, except that Elkies used
<a href="#blocker">blockers</a> instead of <a href="lex_m.htm#mold">molds</a>, the improvement being found by
David Bell later the same month.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.OO....................................
.OO.................O..................
...................O.O............O.O..
....................O............O.....
OO.......OO.......................O..O.
OO.O.....OO.......................O.O.O
...O.......................O.......O..O
...O.......................OO.......OO.
O..O.................OO.....O..........
.OO..................O.................
.....................OOO...............
....................................OO.
....................................OO.
.OO....................................
O..O...................................
O.O.O................O.O....OO.....OO..
.O..O.................OO....OO.....OO.O
.....O............O...O...............O
..O.O............O.O..................O
..................O................O..O
....................................OO.
</a></pre></td></tr></table></center>
<p><a name=babblingbrook>:</a><b>babbling brook</b> Any <a href="lex_o.htm#oscillator">oscillator</a> whose <a href="lex_r.htm#rotor">rotor</a> consists of a string
of cells each of which is adjacent to exactly two other rotor cells,
except for the endpoints which are adjacent to only one other rotor
cell. Compare <a href="lex_m.htm#mutteringmoat">muttering moat</a>. Examples include the <a href="#beacon">beacon</a>, the
<a href="lex_g.htm#greatonoff">great on-off</a>, the <a href="lex_l.htm#lightbulb">light bulb</a> and the <a href="lex_s.htm#sparkcoil">spark coil</a>. The following
less trivial example (by Dean Hickerson, August 1997) is the only
one known with more than four cells in its rotor. It is p4 and has
a 6-cell rotor.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.......O........
.....OOO....OO..
....O...OO..O...
.O..O.OO..O.O...
O.O.O....OO..OO.
.OO..OO....O.O.O
...O.O..OO.O..O.
...O..OO...O....
..OO....OOO.....
........O.......
</a></pre></td></tr></table></center>
<p><a name=backrake>:</a><b>backrake</b> Another term for a backwards <a href="lex_r.htm#rake">rake</a>. A p8 example by
Jason Summers is shown below. See <a href="lex_t.htm#totalaperiodic">total aperiodic</a> for a p12
example.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.....OOO...........OOO.....
....O...O.........O...O....
...OO....O.......O....OO...
..O.O.OO.OO.....OO.OO.O.O..
.OO.O....O.OO.OO.O....O.OO.
O....O...O..O.O..O...O....O
............O.O............
OO.......OO.O.O.OO.......OO
............O.O............
......OOO.........OOO......
......O...O.........O......
......O.O....OOO...........
............O..O....OO.....
...............O...........
...........O...O...........
...........O...O...........
...............O...........
............O.O............
</a></pre></td></tr></table></center>
<p><a name=backwardglider>:</a><b>backward glider</b> A <a href="lex_g.htm#glider">glider</a> which moves at least partly in the
opposite direction to the <a href="lex_p.htm#puffer">puffer</a>(s) or <a href="lex_s.htm#spaceship">spaceship</a>(s) under
consideration.
<p><a name=baker>:</a><b>baker</b> (<i>c</i> p4 fuse) A <a href="lex_f.htm#fuse">fuse</a> by Keith McClelland.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..............OO
.............O.O
............O...
...........O....
..........O.....
.........O......
........O.......
.......O........
......O.........
.....O..........
....O...........
...O............
OOO.............
.O..............
</a></pre></td></tr></table></center>
<p><a name=bakersdozen>:</a><b>baker's dozen</b> (p12) A <a href="lex_l.htm#loaf">loaf</a> <a href="lex_h.htm#hassle">hassled</a> by two <a href="#block">blocks</a> and two
<a href="lex_c.htm#caterer">caterers</a>. The original form (using p4 and p6 oscillators to
do the hassling) was found by Robert Wainwright in August 1989.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO.........OO..........
OOOO.O.....OO..........
O.O..OOO...............
...........O...........
....OO....O.O..........
....O.....O..O....O....
...........OO....OO....
.......................
...............OOO..O.O
..........OO.....O.OOOO
..........OO.........OO
</a></pre></td></tr></table></center>
<p><a name=bakery>:</a><b>bakery</b> (p1) A common formation of two bi-loaves.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
....OO....
...O..O...
...O.O....
.OO.O...O.
O..O...O.O
O.O...O..O
.O...O.OO.
....O.O...
...O..O...
....OO....
</a></pre></td></tr></table></center>
<p><a name=barberpole>:</a><b>barberpole</b> Any p2 oscillator in the infinite sequence <a href="#bipole">bipole</a>,
<a href="lex_t.htm#tripole">tripole</a>, <a href="lex_q.htm#quadpole">quadpole</a>, <a href="lex_p.htm#pentapole">pentapole</a>, <a href="lex_h.htm#hexapole">hexapole</a>, <a href="lex_h.htm#heptapole">heptapole</a> ...
(It wasn't my idea to suddenly change from Latin to Greek.)
This sequence of oscillators was found by the MIT group in 1970.
The term is also used (usually in the form "barber pole") to
describe other <a href="lex_e.htm#extensible">extensible</a> sections of oscillators or spaceships,
especially those (usually of period 2) in which all generations
look alike except for a translation and/or rotation/reflection.
<p><a name=barberpoleintersection>:</a><b>barberpole intersection</b> = <a href="lex_q.htm#quad">quad</a>
<p><a name=barberspole>:</a><b>barber's pole</b> = <a href="#barberpole">barberpole</a>
<p><a name=barge>:</a><b>barge</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.O..
O.O.
.O.O
..O.
</a></pre></td></tr></table></center>
<p><a name=basicshuttle>:</a><b>basic shuttle</b> = <a href="lex_q.htm#queenbeeshuttle">queen bee shuttle</a>
<p><a name=beacon>:</a><b>beacon</b> (p2) The third most common <a href="lex_o.htm#oscillator">oscillator</a>. Found by Conway,
March 1970.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO..
O...
...O
..OO
</a></pre></td></tr></table></center>
<p><a name=beaconmaker>:</a><b>beacon maker</b> (<i>c</i> p8 fuse)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..............OO
.............O.O
............O...
...........O....
..........O.....
.........O......
........O.......
.......O........
......O.........
.....O..........
....O...........
...O............
OOO.............
..O.............
..O.............
</a></pre></td></tr></table></center>
<p><a name=beehive>:</a><b>beehive</b> (p1) The second most common <a href="lex_s.htm#stilllife">still life</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.OO.
O..O
.OO.
</a></pre></td></tr></table></center>
<p><a name=beehiveanddock>:</a><b>beehive and dock</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
...OO.
..O..O
...OO.
......
.OOOO.
O....O
OO..OO
</a></pre></td></tr></table></center>
<p><a name=beehiveonbigtable>:</a><b>beehive on big table</b> = <a href="#beehiveanddock">beehive and dock</a>
<p><a name=beehivepusher>:</a><b>beehive pusher</b> = <a href="lex_h.htm#hivenudger">hivenudger</a>
<p><a name=beehivewithtail>:</a><b>beehive with tail</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.OO...
O..O..
.OO.O.
....O.
....OO
</a></pre></td></tr></table></center>
<p><a name=bellyspark>:</a><b>belly spark</b> The spark of a <a href="lex_m.htm#mwss">MWSS</a> or <a href="lex_h.htm#hwss">HWSS</a> other than the
<a href="lex_t.htm#tailspark">tail spark</a>.
<p><a name=bentkeys>:</a><b>bent keys</b> (p3) Found by Dean Hickerson, August 1989. See also
<a href="lex_o.htm#oddkeys">odd keys</a> and <a href="lex_s.htm#shortkeys">short keys</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.O........O.
O.O......O.O
.O.OO..OO.O.
....O..O....
....O..O....
</a></pre></td></tr></table></center>
<p><a name=bheptomino>:</a><b>B-heptomino</b> (stabilizes at time 148) This is a very common
pattern. It often arises with the cell at top left shifted one
space to the left, which does not affect the subsequent evolution.
B-heptominoes acquired particular importance in 1996 due
to Dave Buckingham's work on <a href="#btrack">B tracks</a> - see in particular
<a href="lex_m.htm#myexperiencewithbheptominosinoscillators">My Experience with B-heptominos in Oscillators</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
O.OO
OOO.
.O..
</a></pre></td></tr></table></center>
<p><a name=bheptominoshuttle>:</a><b>B-heptomino shuttle</b> = <a href="lex_t.htm#twinbeesshuttle">twin bees shuttle</a>
<p><a name=biblock>:</a><b>bi-block</b> (p1) The smallest <a href="lex_p.htm#pseudostilllife">pseudo still life</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO.OO
OO.OO
</a></pre></td></tr></table></center>
<p><a name=biboat>:</a><b>bi-boat</b> = <a href="#boattie">boat-tie</a>
<p><a name=biclock>:</a><b>biclock</b> The following <a href="lex_p.htm#pureglidergenerator">pure glider generator</a> consisting of two
<a href="lex_c.htm#clock">clocks</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..O....
OO.....
..OO...
.O...O.
...OO..
.....OO
....O..
</a></pre></td></tr></table></center>
<p><a name=bigbeacon>:</a><b>big beacon</b> = <a href="lex_f.htm#figure8">figure-8</a>
<p><a name=bigfish>:</a><b>big fish</b> = <a href="lex_h.htm#hwss">HWSS</a>
<p><a name=bigglider>:</a><b>big glider</b> (<i>c</i>/4 diagonally, p4) This was found by Dean Hickerson in
December 1989 and was the first known diagonal <a href="lex_s.htm#spaceship">spaceship</a> other than
the <a href="lex_g.htm#glider">glider</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
...OOO............
...O..OOO.........
....O.O...........
OO.......O........
O.O....O..O.......
O........OO.......
.OO...............
.O..O.....O.OO....
.O.........OO.O...
...O.O......OO..O.
....OO.O....OO...O
........O.......O.
.......OOOO...O.O.
.......O.OO...OOOO
........O...OO.O..
.............OO...
.........O.OOO....
..........O..O....
</a></pre></td></tr></table></center>
<p><a name=bigs>:</a><b>big S</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
....OO.
...O..O
...O.OO
OO.O...
O..O...
.OO....
</a></pre></td></tr></table></center>
<p><a name=bigtable>:</a><b>big table</b> = <a href="lex_d.htm#dock">dock</a>
<p><a name=billiardtableconfiguration>:</a><b>billiard table configuration</b> Any <a href="lex_o.htm#oscillator">oscillator</a> in which the <a href="lex_r.htm#rotor">rotor</a>
is enclosed within the <a href="lex_s.htm#stator">stator</a>. Examples include <a href="lex_a.htm#airforce">airforce</a>,
<a href="lex_c.htm#cauldron">cauldron</a>, <a href="lex_c.htm#clockii">clock II</a>, <a href="lex_h.htm#hertzoscillator">Hertz oscillator</a>, <a href="lex_n.htm#negentropy">negentropy</a>,
<a href="lex_p.htm#pinwheel">pinwheel</a>, <a href="lex_p.htm#pressurecooker">pressure cooker</a> and <a href="lex_s.htm#scrubber">scrubber</a>.
<p><a name=biloaf>:</a><b>bi-loaf</b> This term has been used in at least three different senses.
A bi-loaf can be half a <a href="#bakery">bakery</a>:
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.O.....
O.O....
O..O...
.OO.O..
...O.O.
...O..O
....OO.
</a></pre></td></tr></table></center>
or it can be the following much less common <a href="lex_s.htm#stilllife">still life</a>:
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..O....
.O.O...
O..O...
.OO.OO.
...O..O
...O.O.
....O..
</a></pre></td></tr></table></center>
or the following <a href="lex_p.htm#pureglidergenerator">pure glider generator</a>:
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..O.
.O.O
O..O
.OO.
O..O
O.O.
.O..
</a></pre></td></tr></table></center>
<p><a name=bipole>:</a><b>bipole</b> (p2) The <a href="#barberpole">barberpole</a> of length 2.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO...
O.O..
.....
..O.O
...OO
</a></pre></td></tr></table></center>
<p><a name=bipond>:</a><b>bi-pond</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.OO....
O..O...
O..O...
.OO.OO.
...O..O
...O..O
....OO.
</a></pre></td></tr></table></center>
<p><a name=biship>:</a><b>bi-ship</b> = <a href="lex_s.htm#shiptie">ship-tie</a>
<p><a name=bit>:</a><b>bit</b> A live <a href="lex_c.htm#cell">cell</a>.
<p><a name=bitingoffmorethantheycanchew>:</a><b>biting off more than they can chew</b> (p3) Found by Peter Raynham,
July 1972.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
O...........
OOO.........
...O........
..OO........
...OO.......
....OO......
...O..O.....
...O..OO....
....OO.OOO..
........O.O.
..........O.
..........OO
</a></pre></td></tr></table></center>
<p><a name=blackwhite>:</a><b>Black&amp;White</b> = <a href="lex_i.htm#immigration">Immigration</a>
<p><a name=blastingcap>:</a><b>blasting cap</b> The <a href="lex_p.htm#piheptomino">pi-heptomino</a> (after the shape at generation 1).
A term used at MIT and still occasionally encountered.
<p><a name=blinker>:</a><b>blinker</b> (p2) The smallest and most common <a href="lex_o.htm#oscillator">oscillator</a>. Found by
Conway, March 1970.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OOO
</a></pre></td></tr></table></center>
<p><a name=blinkerpuffer>:</a><b>blinker puffer</b> Any <a href="lex_p.htm#puffer">puffer</a> whose output is <a href="#blinker">blinkers</a>. However,
the term is particularly used for p8 <i>c</i>/2 puffers. The first such
blinker puffer was found by Robert Wainwright in 1984, and was
unexpectedly simple:
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
...O.....
.O...O...
O........
O....O...
OOOOO....
.........
.........
.........
.OO......
OO.OOO...
.OOOO....
..OO.....
.........
.....OO..
...O....O
..O......
..O.....O
..OOOOOO.
</a></pre></td></tr></table></center>
Since then many more blinker puffers have been found. The following
one was found by David Bell in 1992 when he was trying to extend an
<a href="lex_x.htm#x66">x66</a>:
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.............OOO.
............OOOOO
...........OO.OOO
............OO...
.................
.................
.........O.O.....
..O.....O..O.....
.OOOOO...O.O.....
OO...OO.OO.......
.O.......O.......
..OO..O..O.......
..........O......
..OO..O..O.......
.O.......O.......
OO...OO.OO.......
.OOOOO...O.O.....
..O.....O..O.....
.........O.O.....
.................
.................
............OO...
...........OO.OOO
............OOOOO
.............OOO.
</a></pre></td></tr></table></center>
The importance of this larger blinker puffer (and others like it), is
that the engine which produces the blinker output is only p4. The
blinker row produced by the puffer can easily be ignited, and burns
cleanly with a speed of 2<i>c</i>/3. When the burning catches up to the
engine, it causes a <a href="lex_p.htm#phasechange">phase change</a> in the puffer. This fact allows
p8 blinker puffers to be used to construct rakes of all periods which
are large multiples of four.
<p><a name=blinkersbitpole>:</a><b>blinkers bit pole</b> (p2) Found by Robert Wainwright, June 1977.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.....OO
OOO.O.O
.......
.O.O..O
O....O.
OO...O.
</a></pre></td></tr></table></center>
<p><a name=blinkership>:</a><b>blinker ship</b> A <a href="lex_g.htm#growingspaceship">growing spaceship</a> in which the wick consists of
a line of <a href="#blinker">blinkers</a>. An example by Paul Schick based on his
<a href="lex_s.htm#schickengine">Schick engine</a> is shown below. Here the front part is p12 and
moves at <i>c</i>/2, while the back part is p26 and moves at 6<i>c</i>/13. Every
156 generations 13 blinkers are created and 12 are destroyed, so the
wick becomes one blinker longer.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..........OOOO.............
..........O...O............
..........O................
.OO........O..O............
OO.OO......................
.OOOO...O..................
..OO...O.OO........O....OOO
......O...O........O....O.O
..OO...O.OO........O....OOO
.OOOO...O..................
OO.OO......................
.OO........O..O............
..........O................
..........O...O............
..........OOOO.............
</a></pre></td></tr></table></center>
<p><a name=block>:</a><b>block</b> (p1) The most common <a href="lex_s.htm#stilllife">still life</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO
OO
</a></pre></td></tr></table></center>
<p><a name=blockade>:</a><b>blockade</b> (p1) A common formation of four blocks. The final form
of <a href="lex_l.htm#lumpsofmuck">lumps of muck</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO.....................
OO.....................
.......................
.......................
.OO.................OO.
.OO.................OO.
.......................
.......................
.....................OO
.....................OO
</a></pre></td></tr></table></center>
<p><a name=blockanddock>:</a><b>block and dock</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
...OO.
...OO.
......
.OOOO.
O....O
OO..OO
</a></pre></td></tr></table></center>
<p><a name=blockandglider>:</a><b>block and glider</b> (stabilizes at time 106)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO..
O.O.
..OO
</a></pre></td></tr></table></center>
<p><a name=blocker>:</a><b>blocker</b> (p8) Found by Robert Wainwright. See also <a href="lex_f.htm#filter">filter</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
......O.O.
.....O....
OO..O....O
OO.O..O.OO
....OO....
</a></pre></td></tr></table></center>
<p><a name=blockonbigtable>:</a><b>block on big table</b> = <a href="#blockanddock">block and dock</a>
<p><a name=blockontable>:</a><b>block on table</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..OO
..OO
....
OOOO
O..O
</a></pre></td></tr></table></center>
<p><a name=blockpusher>:</a><b>block pusher</b> A pattern emitting streams of <a href="lex_g.htm#glider">gliders</a> which can
repeatedly push a block further away. This can be used as part of a
<a href="lex_s.htm#slidingblockmemory">sliding block memory</a>.
<p>The following pattern, in which three gliders push a block one cell
diagonally, is an example of how a block pusher works.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
...................O.O
...................OO.
....................O.
......................
......................
......................
...O..................
..O...................
..OOO.................
......................
......................
......................
......................
OO...O................
OO...O.O..............
.....OO...............
</a></pre></td></tr></table></center>
<p><a name=blom>:</a><b>blom</b> (stabilizes at time 23314) The following <a href="lex_m.htm#methuselah">methuselah</a>, found by
Dean Hickerson in July 2002.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
O..........O
.OOOO......O
..OO.......O
..........O.
........O.O.
</a></pre></td></tr></table></center>
<p><a name=blonk>:</a><b>blonk</b> A <a href="#block">block</a> or a <a href="#blinker">blinker</a>. This term is mainly used in the
context of <a href="lex_s.htm#sparselife">sparse Life</a> and was coined by Rich Schroeppel in
September 1992.
<p><a name=blonker>:</a><b>blonker</b> (p6) The following <a href="lex_o.htm#oscillator">oscillator</a>, found by Nicolay Beluchenko
in April 2004.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
O..OO....O..
OO..O.OO.O..
....O.O.....
.....OO.....
.......O....
.......O...O
.........O.O
..........O.
</a></pre></td></tr></table></center>
<p><a name=boat>:</a><b>boat</b> (p1) The only 5-cell <a href="lex_s.htm#stilllife">still life</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO.
O.O
.O.
</a></pre></td></tr></table></center>
<p><a name=boatbit>:</a><b>boat-bit</b> A binary digit represented by the presence of a
<a href="#boat">boat</a> next to a <a href="lex_s.htm#snake">snake</a> (or other suitable object, such as
an <a href="lex_a.htm#aircraftcarrier">aircraft carrier</a>). The bit can be toggled by a <a href="lex_g.htm#glider">glider</a>
travelling along a certain path. A correctly timed glider on a
crossing path can detect whether the transition was from 1 to 0
(in which case the crossing glider is deleted) or from 0 to 1 (in
which case it passes unharmed). Three gliders therefore suffice for
a non-destructive read. The mechanisms involved are shown in the
diagram below. Here the bit is shown in state 0. It is about to
be set to 1 and then switched back to 0 again. The first crossing
glider will survive, but the second will be destroyed. (In January
1997 David Bell found a method of reading the bit while setting it
to 0. A <a href="lex_m.htm#mwss">MWSS</a> is fired at the boat-bit. If it is already 0 then
the MWSS passes unharmed, but if it is 1 then the boat and the MWSS
are destroyed and, with the help of an <a href="lex_e.htm#eater1">eater1</a>, converted into a
glider which travels back along exactly the same path that is used
by the gliders that toggle the boat-bit.)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
......O..................
.......O.................
.....OOO.................
.........................
.........................
.........................
.........................
.........................
.........................
.........................
................O........
..............O.O........
..........OO...OO........
...........OO............
..........O..........O.OO
.....................OO.O
.........................
.........................
.........................
.........................
.........................
.O.......................
.OO......................
O.O......................
</a></pre></td></tr></table></center>
<p><a name=boatmaker>:</a><b>boat maker</b> (<i>c</i> p4 fuse)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
................OO
...............O.O
..............O...
.............O....
............O.....
...........O......
..........O.......
.........O........
........O.........
.......O..........
......O...........
.....O............
OOOOO.............
....O.............
....O.............
....O.............
....O.............
</a></pre></td></tr></table></center>
<p><a name=boatonboat>:</a><b>boat on boat</b> = <a href="#boattie">boat-tie</a>
<p><a name=boatshiptie>:</a><b>boat-ship-tie</b> = <a href="lex_s.htm#shiptieboat">ship tie boat</a>
<p><a name=boatstretcher>:</a><b>boatstretcher</b> See <a href="lex_t.htm#tubstretcher">tubstretcher</a>.
<p><a name=boattie>:</a><b>boat-tie</b> (p1) A 10-cell <a href="lex_s.htm#stilllife">still life</a> consisting of two <a href="#boat">boats</a> placed
tip-to-tip. The name is a pun on "bow tie".
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.O....
O.O...
.OO...
...OO.
...O.O
....O.
</a></pre></td></tr></table></center>
<p><a name=boojumreflector>:</a><b>boojum reflector</b> (p1) Dave Greene's name for the following
<a href="lex_r.htm#reflector">reflector</a> which he found in April 2001, and which is currently
the smallest known <a href="lex_s.htm#stable">stable</a> reflector.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
....O.O......OO.............................
.....OO......OO.............................
.....O......................................
............................................
............................................
............................................
............................................
............................................
............................................
........................................O...
.......................................O.O..
.......................................O.O..
....................OO................OO.OO.
....................OO......................
......................................OO.OO.
..OO..................................OO.O..
.O.O.......................................O
.O........................................OO
OO..........................................
............................................
..................................OO........
..................................OO....OO..
...........OO...........................O.O.
..........O.O.............................O.
..........O...............................OO
.........OO.......................OO........
..................................OO........
............................................
............................................
.............................O..............
............................O.O.............
.............................O..............
</a></pre></td></tr></table></center>
<p><a name=bookend>:</a><b>bookend</b> The following <a href="lex_i.htm#inductioncoil">induction coil</a>. It is generation 1 of
<a href="lex_c.htm#century">century</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..OO
O..O
OOO.
</a></pre></td></tr></table></center>
<p><a name=bookends>:</a><b>bookends</b> (p1)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
OO...OO
O.O.O.O
..O.O..
.OO.OO.
</a></pre></td></tr></table></center>
<p><a name=boss>:</a><b>boss</b> (p4) Found by Dave Buckingham, 1972.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.....O.....
....O.O....
....O.O....
...OO.OO...
..O.....O..
.O.O.O.O.O.
.O.O...O.O.
OO.O...O.OO
O..O.O.O..O
..O.....O..
...OO.OO...
....O.O....
....O.O....
.....O.....
</a></pre></td></tr></table></center>
<p><a name=bottle>:</a><b>bottle</b> (p8) Found by Achim Flammenkamp in August 1994. The name is
a back-formation from <a href="lex_s.htm#shipinabottle">ship in a bottle</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
....OO......OO....
...O..O....O..O...
...O.O......O.O...
.OO..OOO..OOO..OO.
O......O..O......O
O.OO..........OO.O
.O.O..........O.O.
...OO........OO...
..................
..................
...OO........OO...
.O.O..........O.O.
O.OO..........OO.O
O......O..O......O
.OO..OOO..OOO..OO.
...O.O......O.O...
...O..O....O..O...
....OO......OO....
</a></pre></td></tr></table></center>
<p><a name=boundingbox>:</a><b>bounding box</b> The smallest rectangular array of cells that contains
the whole of a given pattern. For <a href="lex_o.htm#oscillator">oscillators</a> and <a href="lex_g.htm#gun">guns</a> this
usually is meant to include all <a href="lex_p.htm#phase">phases</a> of the pattern, but
excludes, in the case of guns, the outgoing stream(s).
<p><a name=bowtie>:</a><b>bow tie</b> = <a href="#boattie">boat-tie</a>
<p><a name=brain>:</a><b>brain</b> (<i>c</i>/3 orthogonally, p3) Found by David Bell, May 1992.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.OOO.........OOO.
O.O.OO.....OO.O.O
O.O.O.......O.O.O
.O.OO.OO.OO.OO.O.
.....O.O.O.O.....
...O.O.O.O.O.O...
..OO.O.O.O.O.OO..
..OOO..O.O..OOO..
..OO..O...O..OO..
.O....OO.OO....O.
.O.............O.
</a></pre></td></tr></table></center>
<p><a name=breeder>:</a><b>breeder</b> Any pattern whose <a href="lex_p.htm#population">population</a> grows at a quadratic rate,
although it is usual to exclude <a href="lex_s.htm#spacefiller">spacefillers</a>. It is easy to see
that this is the fastest possible growth rate.
<p>The term is also sometimes used to mean specifically the breeder
created by Bill Gosper's group at MIT, which was the first known
pattern exhibiting superlinear growth.
<p>There are four basic types of breeder, known as MMM, MMS, MSM and
SMM (where M=moving and S=stationary). Typically an MMM breeder is a
<a href="lex_r.htm#rake">rake</a> <a href="lex_p.htm#puffer">puffer</a>, an MMS breeder is a puffer producing puffers which
produce stationary objects (<a href="lex_s.htm#stilllife">still lifes</a> and/or <a href="lex_o.htm#oscillator">oscillators</a>),
an MSM breeder is a <a href="lex_g.htm#gun">gun</a> puffer and an SMM breeder is a rake gun.
There are, however, less obvious variants of these types. The
original breeder was of type MSM (a p64 puffer puffing p30 glider
guns).
<p>The known breeder with the smallest initial population is the
<a href="lex_m.htm#metacatacryst">metacatacryst</a>.
<p><a name=bridge>:</a><b>bridge</b> A term used in naming certain <a href="lex_s.htm#stilllife">still lifes</a> (and the <a href="lex_s.htm#stator">stator</a>
part of certain <a href="lex_o.htm#oscillator">oscillators</a>). It indicates that the object
consists of two smaller objects joined edge to edge, as in
<a href="lex_s.htm#snakebridgesnake">snake bridge snake</a>.
<p><a name=brokenlines>:</a><b>broken lines</b> A pattern constructed by Dean Hickerson in May 2005
which produces complex broken lines of gliders and blocks.
<p><a name=broth>:</a><b>broth</b> = <a href="lex_s.htm#soup">soup</a>
<p><a name=btc>:</a><b>BTC</b> = <a href="#billiardtableconfiguration">billiard table configuration</a>
<p><a name=btrack>:</a><b>B track</b> A <a href="lex_t.htm#track">track</a> for <a href="#bheptomino">B-heptominoes</a>. The term is more-or-less
synonymous with <a href="lex_h.htm#herscheltrack">Herschel track</a>, since a B-heptomino becomes a
Herschel plus a block in twenty generations.
<p><a name=buckaroo>:</a><b>buckaroo</b> A <a href="lex_q.htm#queenbeeshuttle">queen bee shuttle</a> stabilized at one end by an eater
in such a way that it can turn a glider, as shown below. This was
found by Dave Buckingham in the 1970s. The name is due to Bill
Gosper.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..O.....................
O.O.....................
.OO.....................
...........O............
.........O.O............
........O.O.............
.......O..O...........OO
........O.O...........OO
...OO....O.O............
..O.O......O............
..O.....................
.OO.....................
</a></pre></td></tr></table></center>
<p><a name=bulletheptomino>:</a><b>bullet heptomino</b> Generation 1 of the <a href="lex_t.htm#ttetromino">T-tetromino</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.O.
OOO
OOO
</a></pre></td></tr></table></center>
<p><a name=bun>:</a><b>bun</b> The following <a href="lex_i.htm#inductioncoil">induction coil</a>. By itself this is a common
<a href="lex_p.htm#predecessor">predecessor</a> of the <a href="lex_h.htm#honeyfarm">honey farm</a>. See also <a href="lex_c.htm#cismirroredrbee">cis-mirrored R-bee</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.OO.
O..O
.OOO
</a></pre></td></tr></table></center>
<p><a name=bunnies>:</a><b>bunnies</b> (stabilizes at time 17332) This is a <a href="lex_p.htm#parent">parent</a> of <a href="lex_r.htm#rabbits">rabbits</a>
and was found independently by Robert Wainwright and Andrew
Trevorrow.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
O.....O.
..O...O.
..O..O.O
.O.O....
</a></pre></td></tr></table></center>
<p><a name=burloaf>:</a><b>burloaf</b> = <a href="lex_l.htm#loaf">loaf</a>
<p><a name=burloaferimeter>:</a><b>burloaferimeter</b> (p7) Found by Dave Buckingham in 1972. See also
<a href="lex_a.htm#airforce">airforce</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
....OO....
.....O....
....O.....
...O.OOO..
...O.O..O.
OO.O...O.O
OO.O....O.
....OOOO..
..........
....OO....
....OO....
</a></pre></td></tr></table></center>
<p><a name=bushing>:</a><b>bushing</b> That part of the <a href="lex_s.htm#stator">stator</a> of an <a href="lex_o.htm#oscillator">oscillator</a> which is
adjacent to the <a href="lex_r.htm#rotor">rotor</a>. Compare <a href="lex_c.htm#casing">casing</a>.
<p><a name=butterfly>:</a><b>butterfly</b> The following pattern, or the formation of two beehives
that it evolves into after 33 generations. (Compare <a href="lex_t.htm#teardrop">teardrop</a>,
where the beehives are five cells closer together.)
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
O...
OO..
O.O.
.OOO
</a></pre></td></tr></table></center>
<p><a name=byflops>:</a><b>by flops</b> (p2) Found by Robert Wainwright.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
...O..
.O.O..
.....O
OOOOO.
.....O
.O.O..
...O..
</a></pre></td></tr></table></center>
<hr>
<center>
<font size=-1><b>
<a href="lex_1.htm">1-9</a> |
<a href="lex_a.htm">A</a> |
<a href="lex_b.htm">B</a> |
<a href="lex_c.htm">C</a> |
<a href="lex_d.htm">D</a> |
<a href="lex_e.htm">E</a> |
<a href="lex_f.htm">F</a> |
<a href="lex_g.htm">G</a> |
<a href="lex_h.htm">H</a> |
<a href="lex_i.htm">I</a> |
<a href="lex_j.htm">J</a> |
<a href="lex_k.htm">K</a> |
<a href="lex_l.htm">L</a> |
<a href="lex_m.htm">M</a> |
<a href="lex_n.htm">N</a> |
<a href="lex_o.htm">O</a> |
<a href="lex_p.htm">P</a> |
<a href="lex_q.htm">Q</a> |
<a href="lex_r.htm">R</a> |
<a href="lex_s.htm">S</a> |
<a href="lex_t.htm">T</a> |
<a href="lex_u.htm">U</a> |
<a href="lex_v.htm">V</a> |
<a href="lex_w.htm">W</a> |
<a href="lex_x.htm">X</a> |
<a href="lex_y.htm">Y</a> |
<A href="lex_z.htm">Z</A></b></font>

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